diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenAnnotatingVisitor.java b/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenAnnotatingVisitor.java
index 85aaaf21f17..c61de402204 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenAnnotatingVisitor.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenAnnotatingVisitor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2013 JetBrains s.r.o.
+ * Copyright 2010-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -171,7 +171,9 @@ class CodegenAnnotatingVisitor extends JetVisitorVoid {
     @Override
     public void visitClassObject(@NotNull JetClassObject classObject) {
         ClassDescriptor classDescriptor = bindingContext.get(CLASS, classObject.getObjectDeclaration());
-        assert classDescriptor != null;
+
+        assert classDescriptor != null : String.format("No class found in binding context for: \n---\n%s\n---\n",
+                                                       JetPsiUtil.getElementTextWithContext(classObject));
 
         String name = peekFromStack(nameStack) + JvmAbi.CLASS_OBJECT_SUFFIX;
         recordClosure(classObject, classDescriptor, name);
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenBinding.java b/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenBinding.java
index 60ef4d09c8d..2bfcfe11545 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenBinding.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/binding/CodegenBinding.java
@@ -337,8 +337,12 @@ public class CodegenBinding {
         }
         for (JetDelegationSpecifier specifier : ((JetClassOrObject) classOrObject).getDelegationSpecifiers()) {
             if (specifier instanceof JetDelegatorToSuperCall) {
-                JetType superType = bindingContext.get(TYPE, specifier.getTypeReference());
-                assert superType != null;
+                JetTypeReference typeReference = specifier.getTypeReference();
+
+                JetType superType = bindingContext.get(TYPE, typeReference);
+                assert superType != null: String.format(
+                        "No type in binding context for  \n---\n%s\n---\n", JetPsiUtil.getElementTextWithContext(specifier));
+
                 ClassDescriptor superClassDescriptor = (ClassDescriptor) superType.getConstructor().getDeclarationDescriptor();
                 assert superClassDescriptor != null;
                 if (!isInterface(superClassDescriptor)) {